| 摘要 |
PURPOSE:To permit the set speed of a car to be detected in high accuracy by transmitting the pulse from a car-speed detecting means into the interrupting input terminal of a microcomputer and detecting whether said pulse continues for a prescribed time or not. CONSTITUTION:The opening degree of a throttle valve 1 for feeding fuel is varied by stepping-in an accelerating pedal 3. The pulse from a car-speed detecting means 16 is input into the interrupting input terminal iRQ of a microcomputer 15. A preset switch 34, variable resistor 35, and an analogue/digital converter 36 are installed, and the car-speed to be set is preset and stored into a memory 23. The car-speed set in correspondance with the pulse from the converter 36 can be detected in high accuracy by detecting the variation of the starting-up or -down of the pulse from the analogue/digital converter 36 in excecution of interrupting programs. |
